Table 2
Physical parameters of the OB stars.
| Nr. | A k | Sp. type | Sp.type | log Teff | log L | Mass | Upperc | Lowerc | log Q0 | |||||||||
| (mag) | (Hanson)a | (Crowther)b | (K) | (L⊙) | (M⊙) | (M⊙) | (M⊙) | (s-1) | ||||||||||
|
|
||||||||||||||||||
| #1† | 2.83 ± 0.29 ‡ | O3If*-O4If | O2-3.5If* | 4.65 ± 0.02 ‡ | 6.28 ± 0.15 ‡ | 130 ± 30 ‡ | 130 | 50 | 50.03-50.10‡ | |||||||||
| #2 | 4.78 ± 0.53 ‡ | O4If-O5.5If | >O3.5If* | 4.55 ± 0.02 ‡ | 6.64 ± 0.25 ‡ | 250 ± 120 ‡ | 240 | 90 | 50.03-50.27‡ | |||||||||
| #3 | 3.50 ± 0.04 | O3-O7V | – | 4.61 ± 0.05 | 6.18 ± 0.13 | 105 ± 20 | – | – | 49.58-50.11 | |||||||||
| #5† | 2.71 ± 0.13 | O3-O5V | – | 4.63 ± 0.02 | 5.82 ± 0.10 | 64 ± 8 | – | – | 49.47-49.72 | |||||||||
| #7† | 2.79 ± 0.08 | O3-O5V | – | 4.63 ± 0.02 | 5.73 ± 0.09 | 57 ± 5 | – | – | 49.39-49.62 | |||||||||
| #8† | 3.55 ± 0.17 | O3-O7V | – | 4.61 ± 0.05 | 5.83 ± 0.15 | 65 ± 13 | – | – | 49.21-49.78 | |||||||||
| #9† | 2.99 ± 0.06 | O3-O7V | – | 4.61 ± 0.05 | 5.58 ± 0.13 | 47 ± 7 | – | – | 48.98-49.51 | |||||||||
| #10 | 2.83 ± 0.29 § | O5-O7V | – | 4.59 ± 0.02 | 5.41 ± 0.42 | 43 ± 17 | – | – | 48.52-49.58 | |||||||||
| #11 | 2.96 ± 0.09 | O3-O5V | – | 4.63 ± 0.02 | 5.57 ± 0.09 | 48 ± 4 | – | – | 49.23-49.46 | |||||||||
| #12 | 3.00 ± 0.08 | O5-O7V | – | 4.59 ± 0.02 | 5.45 ± 0.09 | 40 ± 4 | – | – | 48.89-49.29 | |||||||||
| #14 | 2.98 ± 0.03 | O3-O5V | – | 4.63 ± 0.02 | 5.53 ± 0.08 | 46 ± 4 | – | – | 49.20-49.41 | |||||||||
| #15 | 4.52 ± 0.16 ‡ | O3If*-O4If | O2-3.5If* | 4.64 ± 0.01 ‡ | 6.11 ± (0.10) ‡ | 96 ± 14 ‡ | 100 | 40 | 49.85-49.90‡ | |||||||||
| #17 | 2.63 ± 0.20 | O7-O9.5V | – | 4.54 ± 0.03 | 5.01 ± 0.13 | 24 ± 3 | – | – | 47.79-48.68 | |||||||||
| #18 | 3.21 ± 0.16 | O8-O9.5V | – | 4.52 ± 0.02 | 5.20 ± 0.11 | 28 ± 3 | – | – | 48.02-48.69 | |||||||||
Notes.
Spectral types obtained by comparison with reference stars from Hanson et al. (2005)
Spectral types for Of stars according to criteria from Crowther & Walborn (2011)
The upper and lower mass limits of #1, #2, and #15 for the assumption of chemical homogeneous hydrogen and helium burners using the mass-luminosity relation from Gräfener et al. (2011, Sect. 3.4).
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